The tremendous increase in power was always accompanied by a scary increase in spirit power consumption rate. And even for someone like Fang, he couldn't continue this form for more than two hours at most!
William instantly gave the order to his earth-based monstrous weapon, in addition to the initial three he had before, to dig the ground. He also joined, and the five of them started to dig fast, forming a big hole that started to expand and deepen fast.
The moment that happened, it felt like a bomb just dropped in the entire world. One gate after another fiercely slammed against the ground, opened, and released tons of monsters in mere minutes!
The moment William saw this using his spirit sense he knew it was good he didn't use that Troll before. It happened as he feared, and the enemy was able to summon monster gates.